package slxy.jiangtao.dts.core.util;

import java.lang.reflect.Method;
import java.util.Hashtable;
import java.util.regex.Pattern;

public class ReflectHelper {

  private Class cls;
  /** 传过来的对象 */
  private Object obj;

  /** 存放get方法 */
  private Hashtable<String, Method> getMethods = null;
  /** 存放set方法 */
  private Hashtable<String, Method> setMethods = null;

  /**
   * 定义构造方法 -- 一般来说是个pojo
   *
   * @param o 目标对象
   */
  public ReflectHelper(Object o) {
    obj = o;
    initMethods();
  }

  /** @desc 初始化 */
  public void initMethods() {
    getMethods = new Hashtable<String, Method>();
    setMethods = new Hashtable<String, Method>();
    cls = obj.getClass();
    Method[] methods = cls.getMethods();
    // 定义正则表达式，从方法中过滤出getter / setter 函数.
    String gs = "get(\\w+)";
    Pattern getM = Pattern.compile(gs);
    String ss = "set(\\w+)";
    Pattern setM = Pattern.compile(ss);
    // 把方法中的"set" 或者 "get" 去掉
    String rapl = "$1";
    String param;
    for (int i = 0; i < methods.length; ++i) {
      Method m = methods[i];
      String methodName = m.getName();
      if (Pattern.matches(gs, methodName)) {
        param = getM.matcher(methodName).replaceAll(rapl).toLowerCase();
        getMethods.put(param, m);
      } else if (Pattern.matches(ss, methodName)) {
        param = setM.matcher(methodName).replaceAll(rapl).toLowerCase();
        setMethods.put(param, m);
      } else {
        System.out.println(methodName + " 不是getter,setter方法！");
      }
    }
  }

  /** @desc 调用set方法 */
  public boolean setMethodValue(String property, Object object) {
    Method m = setMethods.get(property.toLowerCase());
    if (m != null) {
      try {
        // 调用目标类的setter函数
        m.invoke(obj, object);
        return true;
      } catch (Exception ex) {
        System.out.println("invoke getter on " + property + " error: " + ex.toString());
        return false;
      }
    }
    return false;
  }

  /** @desc 调用set方法 */
  public Object getMethodValue(String property) {
    Object value = null;
    Method m = getMethods.get(property.toLowerCase());
    if (m != null) {
      try {
        /** 调用obj类的setter函数 */
        value = m.invoke(obj, new Object[] {});

      } catch (Exception ex) {
        System.out.println(("invoke getter on " + property + " error: " + ex.toString()));
        ex.printStackTrace();
      }
    }
    return value;
  }
}
